Kim Nae-seong (Korean: 김내성; May 29, 1909 – February 19, 1957) was a Korean writer. He graduated from the German literature course at Waseda University in Tokyo. He later moved to Seoul in what is today South Korea and made his debut in 1939 with The Demon Man, published in The Chosun Ilbo. He later worked on detective novels such as The White Mask and The White Tower. An unparalleled mystery fiction writer in colonial Korea, he was praised for his meticulously designed narratives and foreshadowing. As a writer of popular novels, he thought deeply on the mass appeal of literature and was active as a radio script writer after Korea's liberation from the Japanese rule. Ttolttoriui moheom (똘똘이의 모험, Ttolttori’s Adventure), penned and designed by Kim, was the first Korean children's drama, which also signaled the beginning of radio drama series. Beginning in 1949, his masterpiece Story of the Youth was published in serial form in the Hankook Ilbo. Many of his works were turned into TV shows and films. While working on The Star of Lost Paradise, which was serialized in the Kyunghyang Shinmun, he died of apoplexy in 1957.
Source: “Kim Nae-sung”, English Wikipedia (CC BY-SA 4.0), excerpt